To be frank, none of this warmup phase is needed. Your other information is good but this type of warmup is unnecessary nonsense.
Do you think some normal users aren't signing up and posting or commenting right away? Do you think normal reddit users need to "warm up" their account to start using it?
Sometimes people find Reddit through a google search and then sign up to make a comment, there's many other scenarios where people won't do this.
I register accounts and on day 1 I begin farming karma without issue. I'm not going to leak my personal step by step here but it's all common sense. I didn't find a genie lamp and ask for this ability, I just made a list of common cases where users would engage sooner and experimented.
Lots of people will spend 7 days aging an account and get suspended anyway because they took more importance to this arbitrary info than behaving like a normal user.
I'll give you and everyone one important piece of advice for not needing to warmup. Avoid subreddits related to wholesome content, relationships, news and politics. Look for smaller highly niched subreddits that could be found from a google search by someone interested in that topic (it could be any topic, sfw or nsfw doesn't matter), and start your warmup there.
Don't bother waiting days to comment, think like a normal user and make comments like a normal user. Avoid using ChatGPT and avoid using emojis in comments as much as possible. Make sure everything else is right and you aren't getting fingerprinted, make sure your IP is high quality, and you'll be fine. Nothing else is needed.